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Databases

Alanis Chua
Alanis Chua
2,830 Points
Posted by Alanis Chua
Alanis Chua
2,830 Points

sql challenge task

We're still using the phone_book, with the columns id, first_name, last_name and phone.

Imagine we're implementing the autocomplete feature for a search facility on the phone where a user can start typing a last name and suggestions will appear. Write a query to retrieve all values from the last name column where the last name value is present. Only retrieve the last_name column.

SELECT last_name FROM phone

how to get the missing information when i am not given a value?

1 Answer

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

The instructions say, "Write a query to retrieve all values from the last name column where the last name value is present." This suggests that not every row will contain a last name. So to handle this, you can add a "WHERE" clause to your query to select only the rows where the "last_name" field is not NULL.

Also, the instructions asked for "all values", so instead of selecting only the "last_name" field, you might use the wildcard "*" to represent all the values on each row.

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